<i18n dev> RFR: 8316974: ListFormat creation is unsuccessful for some of the supported Locales

[Naoto Sato]

Some CLDR locales have partial list patterns, such as only the "end" pattern, and expect "start" and "middle" patterns to be inherited from parent locales. Made the code capable of the inheritance.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/15935/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15935&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316974
  Stats: 39 lines in 2 files changed: 35 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/15935.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15935/head:pull/15935

PR: https://git.openjdk.org/jdk/pull/15935